Dental file



Nov. 26, 1929. c. s. IVORY DENTAL FILE Filed Feb. 21, 1928 l NVENTOR /zs 7Z7? 5. /r0/?Y,

ATTORN Patented Nov. 26, 1929 UNITED STATES earner DENTAL FILE Application filed February 21, 1928.

My invention relates to a new and useful dental file and more particularly to a filing tool especially adapted for preparing a tooth for a porcelain crown jacket.

In preparing a tooth for a crown jacket, the contour of the crown must be removed, decay cut away, undercuts created to be filled in with cement, and sufficient space provided between the tooth being treated and adjacent teeth. This operation is usually carried out by means of a variety of burs, which, however, invariably leave a relatively rough and unfinished surface on the tooth being treated.

and produce a smooth, even surface, I have invented a novel dental file which can be used to smooth or plane down the outer surface of a tooth after the latter has been cut or prepared with the conventional burs.

A further object of my invention is to provide a tool which will give ready access to all parts of the tooth being treated regardless of the location of the tooth in the mouth of the patient.

These files may be made with different bends in order to reach all parts of the mouth,

the blades on some being cut at a right angle to the long axis of the shank of the instrument, and others with the cuts of the blades cut parallel to the long axis of the shank of the instrument, and are used with a push or pull motion, a back and forth motion, or a right and left motion on the stump of a tooth to insure a smooth surface, remove all under cuts near the prepared shoulder, and to round the corners of the stump.

To the above ends my invention consists of a novel dental file comprising a handle portion having a front neck or reduced terminal portion, and a head carried by the end of said reduced terminal portion, said head being provided with single cut, parallel teeth.

In the accompanying sketches Figure 1 represents a side elevation showing my novel dental file and its manner of application to a tooth.

Figure 2 represents on an enlarged scale a perspective view of the upper portion of the file seen in Figure 1.

In Order to plane all irregularities down S'erial No. 255,934.

Figure 3 represents a front elevation of the upper portion of the dental file seen in Figure 2.

Figure & represents a top plan view of Figure 3. j l V Figure 5 represents a view similar to that shown in Figure 8 showing a modification.

Figure 6 represents a perspective view of Figure For the purpose of illustrating my invention I have shown in the accompanying drawings one form thereof which is at present preferred-by me, since the same has been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my inventionis not limited to the precise arrangement and organization of the instrumentalities as herein shown and described.

Referring to the drawings in which like reference characters indicate like parts, 1 designates a dental file embodying my invention comprising the shank orhandle portion 2, and the front neck or reduced portion integral with which is the head 4 which is slightly concaved' and provided with the vertical, single cut pyramidal teeth 5. The neck 3 is suitably bent or deflected as at 6 to give ready access to the teeth and facilitate the operation of the file.

In Figures 5 and 6 I have shown a modified form of my invention, wherein the head i 7 is of rectangular outline and is provided with the horizontally disposed single cut parallel pyramidal teeth 8 which may be advantageously employed in smoothing or planing down the body portion of the tooth 9 below the shoulder 10 by a vertical or up and down movement around the tooth.

By providing my dental file 1 with the vertical or horizontal parallel single cut pyramidal teeth in lieu of the conventional cross cut or point out file surfaces heretofore employed, I am enabled to remove relatively small obstructions or projections on the body of the tooth without affecting the general plane or external area of the tooth.

The instrument having the concave shape with the pyramid cut file blades running parallel to the long axis of the shank of the instrument, seen in Figures 1to 4, is used with a back and forth motion around the lingual and buccal corners of a prepared posterior tooth for a jacket crown, in order to give a smooth round surface free from ridges to this portion of the tooth, and to do the same to the labial and lingual portions of anterior teeth. The instrument having the pyramid cut file blades on a concave shape running at a right angle to the long axis of the shank of the instrument is used with a push or pull motion on the lingual and buccal portions of a prepared posterior tooth for a jacket crown, and also on the labial and lingual portions of a prepared anterior tooth, to leave this surface smooth and free from ridges and sharp corners.

I am aware that the invention may be embodies in other specific forms without departing from the spirit or essential attributes thereof, and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive, reference being had to the appended claim rather than the foregoing description to in dicate the scope of the invention.

. Having thus described my invention what I claim as new and desire to secure by Letters Patent, is c As a new articleof manufacture a dental file comprising a handle the upper portion of which has a reduced neck formed upon an arc of a circle, a head formed integral with said neck and arranged transversely to the longest axis of the handle and slightly concaved, said head having formed thereon s1ngle cut pyramidal teeth which are arranged substantially in parallelism with the longest axis of said handle and upon the inner face of said head.

CHESTER S. IVORY. 

